Austria leads the world in the number of energy-efficient buildings, such as this alpine passive house (above). Below, Fronius’ Sattledt headquarters; the solar panel roof supplies 90 percent of the facility’s energy needs.

Austria leads the world in the number of energy-efficient buildings, such as this alpine passive house (above). Below, Fronius’ Sattledt headquarters; the solar panel roof supplies 90 percent of the facility’s energy needs.

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